dkl65:
How will I wire the circuit to the op-amp (pin-outs)? Lets say I am using the low pass filter described below.
What where below?
In the link is a hybrid solution, an op-amp with a pass transistor.
Instead of a voltage derived from a pot, as shown, the non-inverting (+) input would be connected to this low-pass filter's output.
Forget the link.. here it is --
http://www.zen22142.zen.co.uk/Circuits/Interface/cmscontrol.htm